Differential Amplifier:

The basic differential amplifier is shown in fig. 1.

Fig. 1

Since there are two inputs superposition theorem can be used to find the output voltage. When V_b= 0, then the circuit becomes inverting amplifier, hence the output due to V_a only is

V_o(a) = -(R_f / R₁) V_a

Similarly when, V_a = 0, the configuration is a inverting amplifier having a voltage divided network at the noninverting input

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